remove header operation to http protocol package

common/protocol/http/headers.go

@@ -19,3 +19,26 @@ func ParseXForwardedFor(header http.Header) []net.Address {
 	}
 	return addrs
 }
+
+func RemoveHopByHopHeaders(header http.Header) {
+	// Strip hop-by-hop header based on RFC:
+	// http://www.w3.org/Protocols/rfc2616/rfc2616-sec13.html#sec13.5.1
+	// https://www.mnot.net/blog/2011/07/11/what_proxies_must_do
+
+	header.Del("Proxy-Connection")
+	header.Del("Proxy-Authenticate")
+	header.Del("Proxy-Authorization")
+	header.Del("TE")
+	header.Del("Trailers")
+	header.Del("Transfer-Encoding")
+	header.Del("Upgrade")
+
+	connections := header.Get("Connection")
+	header.Del("Connection")
+	if len(connections) == 0 {
+		return
+	}
+	for _, h := range strings.Split(connections, ",") {
+		header.Del(strings.TrimSpace(h))
+	}
+}